On average 6 to 8 hours of sleep is necessary for the human body.Sleep is a natural part of everybody's life, it is something our bodies need to do, it is not an option. Even though the exact reasons for sleep remain a mystery, we do know that during sleep many of the body's major organ and regulatory systems continue to work actively. Some parts of the brain actually increase their activity dramatically, and the body produces more of certain hormones.
Sleep, like diet and exercise, is important for our minds and bodies to function normally.